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Tetramethylsuccinonitrile

Tetramethylsuccinonitrile or TMSN is an organic compound with the formula (C(CH)CN). Classified as a di[nitrile]], it is a colorless and odorless solid. TMSN is the by-product from the use of some radical initiators used in polymer manufacture.

TMSN is derived from 2,2'-azobis-isobutyronitrile:

(NC(CH)CN) → (C(CH)CN) + N

AIBN is a common radical initiator in the manufacture of polyvinyl chloride polymers.